I have a photo gallery library. I want to get all albums and their images. Now I get all albums (root level items) with something like this:
ClientContext ctx = new ClientContext(_url);
_mylib = web.Lists.GetByTitle("mylib");
_albums = _list.GetItems(new CamlQuery());
_albums represents albums, on the root of the gallery. How do I get files/items in each of these albums?
mylib
-album1
--image1.jpg
--image2.jpg
-album2
--image1.jpg
...
I did something very similar to this recently (Picture Libraries, Client object model, silverlight).
What I did different was each "album" was in it's own Picture Library.
When I give the user the option to select an album, I gather a ListCollection of lists where the BaseType is that of a Picture Library (can't remember the exact number now, search around for it though) - and put this list into a DropdownList.
Stick an event handler onto the DropdownList such that when it's changed, the selected item is pulled out, put into a CAML Query which loads all items from a specified list (by GUID).
In short? Avoid folders, use separate lists/libraries instead. If you must keep them in the same library, then add a column to store an "Album Name". Then do a CAML Query to filter based on a value in this column, this will return all files in a specific "album".
